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/* Generic implementation of the CSHIFT intrinsic

   Copyright 2003, 2005, 2006, 2007, 2010 Free Software Foundation, Inc.

   Contributed by Feng Wang <wf_cs@yahoo.com>

This file is part of the GNU Fortran runtime library (libgfortran).

Libgfortran is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public

License as published by the Free Software Foundation; either

version 3 of the License, or (at your option) any later version.

Libgfortran is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"

#include <stdlib.h>

#include <assert.h>

#include <string.h>

static void

cshift0 (gfc_array_char * ret, const gfc_array_char * array,

         ptrdiff_t shift, int which, index_type size)

{

  /* r.* indicates the return array.  */

  index_type rstride[GFC_MAX_DIMENSIONS];

  index_type rstride0;

  index_type roffset;

  char *rptr;

  /* s.* indicates the source array.  */

  index_type sstride[GFC_MAX_DIMENSIONS];

  index_type sstride0;

  index_type soffset;

  const char *sptr;

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type dim;

  index_type len;

  index_type n;

  index_type arraysize;

  index_type type_size;

  if (which < 1 || which > GFC_DESCRIPTOR_RANK (array))

    runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");

  arraysize = size0 ((array_t *) array);

  if (ret->data == NULL)

    {

      int i;

      ret->offset = 0;

      ret->dtype = array->dtype;

      for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)

        {

          index_type ub, str;

          ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;

          if (i == 0)

            str = 1;

          else

            str = GFC_DESCRIPTOR_EXTENT(ret,i-1) *

              GFC_DESCRIPTOR_STRIDE(ret,i-1);

          GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);

        }

      /* internal_malloc_size allocates a single byte for zero size.  */

      ret->data = internal_malloc_size (size * arraysize);

    }

  else if (unlikely (compile_options.bounds_check))

    {

      bounds_equal_extents ((array_t *) ret, (array_t *) array,

                                 "return value", "CSHIFT");

    }

  if (arraysize == 0)

    return;

  type_size = GFC_DTYPE_TYPE_SIZE (array);

  switch(type_size)

    {

    case GFC_DTYPE_LOGICAL_1:

    case GFC_DTYPE_INTEGER_1:

    case GFC_DTYPE_DERIVED_1:

      cshift0_i1 ((gfc_array_i1 *)ret, (gfc_array_i1 *) array, shift, which);

      return;

    case GFC_DTYPE_LOGICAL_2:

    case GFC_DTYPE_INTEGER_2:

      cshift0_i2 ((gfc_array_i2 *)ret, (gfc_array_i2 *) array, shift, which);

      return;

    case GFC_DTYPE_LOGICAL_4:

    case GFC_DTYPE_INTEGER_4:

      cshift0_i4 ((gfc_array_i4 *)ret, (gfc_array_i4 *) array, shift, which);

      return;

    case GFC_DTYPE_LOGICAL_8:

    case GFC_DTYPE_INTEGER_8:

      cshift0_i8 ((gfc_array_i8 *)ret, (gfc_array_i8 *) array, shift, which);

      return;

#ifdef HAVE_GFC_INTEGER_16

    case GFC_DTYPE_LOGICAL_16:

    case GFC_DTYPE_INTEGER_16:

      cshift0_i16 ((gfc_array_i16 *)ret, (gfc_array_i16 *) array, shift,

                   which);

      return;

#endif

    case GFC_DTYPE_REAL_4:

      cshift0_r4 ((gfc_array_r4 *)ret, (gfc_array_r4 *) array, shift, which);

      return;

    case GFC_DTYPE_REAL_8:

      cshift0_r8 ((gfc_array_r8 *)ret, (gfc_array_r8 *) array, shift, which);

      return;

/* FIXME: This here is a hack, which will have to be removed when

   the array descriptor is reworked.  Currently, we don't store the

   kind value for the type, but only the size.  Because on targets with

   __float128, we have sizeof(logn double) == sizeof(__float128),

   we cannot discriminate here and have to fall back to the generic

   handling (which is suboptimal).  */

#if !defined(GFC_REAL_16_IS_FLOAT128)

# ifdef HAVE_GFC_REAL_10

    case GFC_DTYPE_REAL_10:

      cshift0_r10 ((gfc_array_r10 *)ret, (gfc_array_r10 *) array, shift,

                   which);

      return;

# endif

# ifdef HAVE_GFC_REAL_16

    case GFC_DTYPE_REAL_16:

      cshift0_r16 ((gfc_array_r16 *)ret, (gfc_array_r16 *) array, shift,

                   which);

      return;

# endif

#endif

    case GFC_DTYPE_COMPLEX_4:

      cshift0_c4 ((gfc_array_c4 *)ret, (gfc_array_c4 *) array, shift, which);

      return;

    case GFC_DTYPE_COMPLEX_8:

      cshift0_c8 ((gfc_array_c8 *)ret, (gfc_array_c8 *) array, shift, which);

      return;

/* FIXME: This here is a hack, which will have to be removed when

   the array descriptor is reworked.  Currently, we don't store the

   kind value for the type, but only the size.  Because on targets with

   __float128, we have sizeof(logn double) == sizeof(__float128),

   we cannot discriminate here and have to fall back to the generic

   handling (which is suboptimal).  */

#if !defined(GFC_REAL_16_IS_FLOAT128)

# ifdef HAVE_GFC_COMPLEX_10

    case GFC_DTYPE_COMPLEX_10:

      cshift0_c10 ((gfc_array_c10 *)ret, (gfc_array_c10 *) array, shift,

                   which);

      return;

# endif

# ifdef HAVE_GFC_COMPLEX_16

    case GFC_DTYPE_COMPLEX_16:

      cshift0_c16 ((gfc_array_c16 *)ret, (gfc_array_c16 *) array, shift,

                   which);

      return;

# endif

#endif

    default:

      break;

    }

  switch (size)

    {

      /* Let's check the actual alignment of the data pointers.  If they

         are suitably aligned, we can safely call the unpack functions.  */

    case sizeof (GFC_INTEGER_1):

      cshift0_i1 ((gfc_array_i1 *) ret, (gfc_array_i1 *) array, shift,

                  which);

      break;

    case sizeof (GFC_INTEGER_2):

      if (GFC_UNALIGNED_2(ret->data) || GFC_UNALIGNED_2(array->data))

        break;

      else

        {

          cshift0_i2 ((gfc_array_i2 *) ret, (gfc_array_i2 *) array, shift,

                      which);

          return;

        }

    case sizeof (GFC_INTEGER_4):

      if (GFC_UNALIGNED_4(ret->data) || GFC_UNALIGNED_4(array->data))

        break;

      else

        {

          cshift0_i4 ((gfc_array_i4 *)ret, (gfc_array_i4 *) array, shift,

                      which);

          return;

        }

    case sizeof (GFC_INTEGER_8):

      if (GFC_UNALIGNED_8(ret->data) || GFC_UNALIGNED_8(array->data))

        {

          /* Let's try to use the complex routines.  First, a sanity

             check that the sizes match; this should be optimized to

             a no-op.  */

          if (sizeof(GFC_INTEGER_8) != sizeof(GFC_COMPLEX_4))

            break;

          if (GFC_UNALIGNED_C4(ret->data) || GFC_UNALIGNED_C4(array->data))

            break;

          cshift0_c4 ((gfc_array_c4 *) ret, (gfc_array_c4 *) array, shift,

                      which);

          return;

        }

      else

        {

          cshift0_i8 ((gfc_array_i8 *)ret, (gfc_array_i8 *) array, shift,

                      which);

          return;

        }

#ifdef HAVE_GFC_INTEGER_16

    case sizeof (GFC_INTEGER_16):

      if (GFC_UNALIGNED_16(ret->data) || GFC_UNALIGNED_16(array->data))

        {

          /* Let's try to use the complex routines.  First, a sanity

             check that the sizes match; this should be optimized to

             a no-op.  */

          if (sizeof(GFC_INTEGER_16) != sizeof(GFC_COMPLEX_8))

            break;

          if (GFC_UNALIGNED_C8(ret->data) || GFC_UNALIGNED_C8(array->data))

            break;

          cshift0_c8 ((gfc_array_c8 *) ret, (gfc_array_c8 *) array, shift,

                      which);

          return;

        }

      else

        {

          cshift0_i16 ((gfc_array_i16 *) ret, (gfc_array_i16 *) array,

                       shift, which);

          return;

        }

#else

    case sizeof (GFC_COMPLEX_8):

      if (GFC_UNALIGNED_C8(ret->data) || GFC_UNALIGNED_C8(array->data))

        break;

      else

        {

          cshift0_c8 ((gfc_array_c8 *) ret, (gfc_array_c8 *) array, shift,

                      which);

          return;

        }

#endif

    default:

      break;

    }

  which = which - 1;

  sstride[0] = 0;

  rstride[0] = 0;

  extent[0] = 1;

  count[0] = 0;

  n = 0;

  /* Initialized for avoiding compiler warnings.  */

  roffset = size;

  soffset = size;

  len = 0;

  for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)

    {

      if (dim == which)

        {

          roffset = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);

          if (roffset == 0)

            roffset = size;

          soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);

          if (soffset == 0)

            soffset = size;

          len = GFC_DESCRIPTOR_EXTENT(array,dim);

        }

      else

        {

          count[n] = 0;

          extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);

          rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);

          sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);

          n++;

        }

    }

  if (sstride[0] == 0)

    sstride[0] = size;

  if (rstride[0] == 0)

    rstride[0] = size;

  dim = GFC_DESCRIPTOR_RANK (array);

  rstride0 = rstride[0];

  sstride0 = sstride[0];

  rptr = ret->data;

  sptr = array->data;

  shift = len == 0 ? 0 : shift % (ptrdiff_t)len;

  if (shift < 0)

    shift += len;

  while (rptr)

    {

      /* Do the shift for this dimension.  */

      /* If elements are contiguous, perform the operation

         in two block moves.  */

      if (soffset == size && roffset == size)

        {

          size_t len1 = shift * size;

          size_t len2 = (len - shift) * size;

          memcpy (rptr, sptr + len1, len2);

          memcpy (rptr + len2, sptr, len1);

        }

      else

        {

          /* Otherwise, we'll have to perform the copy one element at

             a time.  */

          char *dest = rptr;

          const char *src = &sptr[shift * soffset];

          for (n = 0; n < len - shift; n++)

            {

              memcpy (dest, src, size);

              dest += roffset;

              src += soffset;

            }

          for (src = sptr, n = 0; n < shift; n++)

            {

              memcpy (dest, src, size);

              dest += roffset;

              src += soffset;

            }

        }

      /* Advance to the next section.  */

      rptr += rstride0;

      sptr += sstride0;

      count[0]++;

      n = 0;

      while (count[n] == extent[n])

        {

          /* When we get to the end of a dimension, reset it and increment

             the next dimension.  */

          count[n] = 0;

          /* We could precalculate these products, but this is a less

             frequently used path so probably not worth it.  */

          rptr -= rstride[n] * extent[n];

          sptr -= sstride[n] * extent[n];

          n++;

          if (n >= dim - 1)

            {

              /* Break out of the loop.  */

              rptr = NULL;

              break;

            }

          else

            {

              count[n]++;

              rptr += rstride[n];

              sptr += sstride[n];

            }

        }

    }

}

#define DEFINE_CSHIFT(N)                                                      \

  extern void cshift0_##N (gfc_array_char *, const gfc_array_char *,          \

                           const GFC_INTEGER_##N *, const GFC_INTEGER_##N *); \

  export_proto(cshift0_##N);                                                  \

                                                                              \

  void                                                                        \

  cshift0_##N (gfc_array_char *ret, const gfc_array_char *array,              \

               const GFC_INTEGER_##N *pshift, const GFC_INTEGER_##N *pdim)    \

  {                                                                           \

    cshift0 (ret, array, *pshift, pdim ? *pdim : 1,                           \

             GFC_DESCRIPTOR_SIZE (array));                                    \

  }                                                                           \

                                                                              \

  extern void cshift0_##N##_char (gfc_array_char *, GFC_INTEGER_4,            \

                                  const gfc_array_char *,                     \

                                  const GFC_INTEGER_##N *,                    \

                                  const GFC_INTEGER_##N *, GFC_INTEGER_4);    \

  export_proto(cshift0_##N##_char);                                           \

                                                                              \

  void                                                                        \

  cshift0_##N##_char (gfc_array_char *ret,                                    \

                      GFC_INTEGER_4 ret_length __attribute__((unused)),       \

                      const gfc_array_char *array,                            \

                      const GFC_INTEGER_##N *pshift,                          \

                      const GFC_INTEGER_##N *pdim,                            \

                      GFC_INTEGER_4 array_length)                             \

  {                                                                           \

    cshift0 (ret, array, *pshift, pdim ? *pdim : 1, array_length);            \

  }                                                                           \

                                                                              \

  extern void cshift0_##N##_char4 (gfc_array_char *, GFC_INTEGER_4,           \

                                   const gfc_array_char *,                    \

                                   const GFC_INTEGER_##N *,                   \

                                   const GFC_INTEGER_##N *, GFC_INTEGER_4);   \

  export_proto(cshift0_##N##_char4);                                          \

                                                                              \

  void                                                                        \

  cshift0_##N##_char4 (gfc_array_char *ret,                                   \

                       GFC_INTEGER_4 ret_length __attribute__((unused)),      \

                       const gfc_array_char *array,                           \

                       const GFC_INTEGER_##N *pshift,                         \

                       const GFC_INTEGER_##N *pdim,                           \

                       GFC_INTEGER_4 array_length)                            \

  {                                                                           \

    cshift0 (ret, array, *pshift, pdim ? *pdim : 1,                           \

             array_length * sizeof (gfc_char4_t));                            \

  }

DEFINE_CSHIFT (1);

DEFINE_CSHIFT (2);

DEFINE_CSHIFT (4);

DEFINE_CSHIFT (8);

#ifdef HAVE_GFC_INTEGER_16

DEFINE_CSHIFT (16);

#endif